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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/jpeg-xl/lib/jxl/base/random.cc | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/base/random.cc')
-rw-r--r-- | third_party/jpeg-xl/lib/jxl/base/random.cc | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/base/random.cc b/third_party/jpeg-xl/lib/jxl/base/random.cc new file mode 100644 index 0000000000..c99f88921c --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/base/random.cc @@ -0,0 +1,21 @@ +// Copyright (c) the JPEG XL Project Authors. All rights reserved. +// +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "lib/jxl/base/random.h" + +#include <cmath> + +namespace jxl { + +Rng::GeometricDistribution::GeometricDistribution(float p) + : inv_log_1mp(1.0 / std::log(1 - p)) {} + +uint32_t Rng::Geometric(const GeometricDistribution& dist) { + float f = UniformF(0, 1); + float log = std::log(1 - f) * dist.inv_log_1mp; + return static_cast<uint32_t>(log); +} + +} // namespace jxl |